mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-19 04:57:53 +00:00
240 lines
9.0 KiB
C++
240 lines
9.0 KiB
C++
/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2017 ZeroTier, Inc. https://www.zerotier.com/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* You can be released from the requirements of the license by purchasing
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* a commercial license. Buying such a license is mandatory as soon as you
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* develop commercial closed-source software that incorporates or links
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* directly against ZeroTier software without disclosing the source code
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* of your own application.
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*/
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#include <algorithm>
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#include "Membership.hpp"
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#include "RuntimeEnvironment.hpp"
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#include "Peer.hpp"
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#include "Topology.hpp"
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#include "Switch.hpp"
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#include "Packet.hpp"
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#include "Node.hpp"
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#define ZT_CREDENTIAL_PUSH_EVERY (ZT_NETWORK_AUTOCONF_DELAY / 3)
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namespace ZeroTier {
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Membership::Membership() :
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_lastUpdatedMulticast(0),
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_lastPushedCom(0),
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_comRevocationThreshold(0),
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_revocations(4),
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_remoteTags(4),
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_remoteCaps(4),
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_remoteCoos(4)
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{
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resetPushState();
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}
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void Membership::pushCredentials(const RuntimeEnvironment *RR,void *tPtr,const uint64_t now,const Address &peerAddress,const NetworkConfig &nconf,int localCapabilityIndex,const bool force)
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{
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bool sendCom = ( (nconf.com) && ( ((now - _lastPushedCom) >= ZT_CREDENTIAL_PUSH_EVERY) || (force) ) );
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const Capability *sendCap;
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if (localCapabilityIndex >= 0) {
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sendCap = &(nconf.capabilities[localCapabilityIndex]);
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if ( ((now - _localCredLastPushed.cap[localCapabilityIndex]) >= ZT_CREDENTIAL_PUSH_EVERY) || (force) )
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_localCredLastPushed.cap[localCapabilityIndex] = now;
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else sendCap = (const Capability *)0;
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} else sendCap = (const Capability *)0;
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const Tag *sendTags[ZT_MAX_NETWORK_TAGS];
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unsigned int sendTagCount = 0;
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for(unsigned int t=0;t<nconf.tagCount;++t) {
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if ( ((now - _localCredLastPushed.tag[t]) >= ZT_CREDENTIAL_PUSH_EVERY) || (force) ) {
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_localCredLastPushed.tag[t] = now;
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sendTags[sendTagCount++] = &(nconf.tags[t]);
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}
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}
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const CertificateOfOwnership *sendCoos[ZT_MAX_CERTIFICATES_OF_OWNERSHIP];
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unsigned int sendCooCount = 0;
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for(unsigned int c=0;c<nconf.certificateOfOwnershipCount;++c) {
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if ( ((now - _localCredLastPushed.coo[c]) >= ZT_CREDENTIAL_PUSH_EVERY) || (force) ) {
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_localCredLastPushed.coo[c] = now;
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sendCoos[sendCooCount++] = &(nconf.certificatesOfOwnership[c]);
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}
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}
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unsigned int tagPtr = 0;
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unsigned int cooPtr = 0;
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while ((tagPtr < sendTagCount)||(cooPtr < sendCooCount)||(sendCom)||(sendCap)) {
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Packet outp(peerAddress,RR->identity.address(),Packet::VERB_NETWORK_CREDENTIALS);
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if (sendCom) {
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sendCom = false;
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nconf.com.serialize(outp);
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_lastPushedCom = now;
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}
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outp.append((uint8_t)0x00);
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if (sendCap) {
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outp.append((uint16_t)1);
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sendCap->serialize(outp);
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sendCap = (const Capability *)0;
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} else outp.append((uint16_t)0);
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const unsigned int tagCountAt = outp.size();
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outp.addSize(2);
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unsigned int thisPacketTagCount = 0;
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while ((tagPtr < sendTagCount)&&((outp.size() + sizeof(Tag) + 16) < ZT_PROTO_MAX_PACKET_LENGTH)) {
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sendTags[tagPtr++]->serialize(outp);
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++thisPacketTagCount;
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}
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outp.setAt(tagCountAt,(uint16_t)thisPacketTagCount);
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// No revocations, these propagate differently
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outp.append((uint16_t)0);
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const unsigned int cooCountAt = outp.size();
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outp.addSize(2);
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unsigned int thisPacketCooCount = 0;
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while ((cooPtr < sendCooCount)&&((outp.size() + sizeof(CertificateOfOwnership) + 16) < ZT_PROTO_MAX_PACKET_LENGTH)) {
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sendCoos[cooPtr++]->serialize(outp);
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++thisPacketCooCount;
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}
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outp.setAt(cooCountAt,(uint16_t)thisPacketCooCount);
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outp.compress();
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RR->sw->send(tPtr,outp,true);
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}
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}
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Membership::AddCredentialResult Membership::addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const CertificateOfMembership &com)
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{
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const uint64_t newts = com.timestamp();
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if (newts <= _comRevocationThreshold) {
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TRACE("addCredential(CertificateOfMembership) for %s on %.16llx REJECTED (revoked)",com.issuedTo().toString().c_str(),com.networkId());
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return ADD_REJECTED;
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}
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const uint64_t oldts = _com.timestamp();
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if (newts < oldts) {
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TRACE("addCredential(CertificateOfMembership) for %s on %.16llx REJECTED (older than current)",com.issuedTo().toString().c_str(),com.networkId());
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return ADD_REJECTED;
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}
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if ((newts == oldts)&&(_com == com)) {
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TRACE("addCredential(CertificateOfMembership) for %s on %.16llx ACCEPTED (redundant)",com.issuedTo().toString().c_str(),com.networkId());
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return ADD_ACCEPTED_REDUNDANT;
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}
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switch(com.verify(RR,tPtr)) {
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default:
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TRACE("addCredential(CertificateOfMembership) for %s on %.16llx REJECTED (invalid signature or object)",com.issuedTo().toString().c_str(),com.networkId());
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return ADD_REJECTED;
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case 0:
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TRACE("addCredential(CertificateOfMembership) for %s on %.16llx ACCEPTED (new)",com.issuedTo().toString().c_str(),com.networkId());
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_com = com;
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return ADD_ACCEPTED_NEW;
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case 1:
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return ADD_DEFERRED_FOR_WHOIS;
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}
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}
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// Template out addCredential() for many cred types to avoid copypasta
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template<typename C>
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static Membership::AddCredentialResult _addCredImpl(Hashtable<uint32_t,C> &remoteCreds,const Hashtable<uint64_t,uint64_t> &revocations,const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const C &cred)
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{
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C *rc = remoteCreds.get(cred.id());
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if (rc) {
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if (rc->timestamp() > cred.timestamp()) {
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TRACE("addCredential(type==%d) for %s on %.16llx REJECTED (older than credential we have)",(int)C::credentialType(),cred.issuedTo().toString().c_str(),cred.networkId());
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return Membership::ADD_REJECTED;
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}
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if (*rc == cred) {
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//TRACE("addCredential(type==%d) for %s on %.16llx ACCEPTED (redundant)",(int)C::credentialType(),cred.issuedTo().toString().c_str(),cred.networkId());
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return Membership::ADD_ACCEPTED_REDUNDANT;
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}
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}
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const uint64_t *const rt = revocations.get(Membership::credentialKey(C::credentialType(),cred.id()));
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if ((rt)&&(*rt >= cred.timestamp())) {
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TRACE("addCredential(type==%d) for %s on %.16llx REJECTED (timestamp below revocation threshold)",(int)C::credentialType(),cred.issuedTo().toString().c_str(),cred.networkId());
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return Membership::ADD_REJECTED;
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}
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switch(cred.verify(RR,tPtr)) {
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default:
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TRACE("addCredential(type==%d) for %s on %.16llx REJECTED (invalid)",(int)C::credentialType(),cred.issuedTo().toString().c_str(),cred.networkId());
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return Membership::ADD_REJECTED;
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case 0:
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TRACE("addCredential(type==%d) for %s on %.16llx ACCEPTED (new)",(int)C::credentialType(),cred.issuedTo().toString().c_str(),cred.networkId());
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if (!rc)
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rc = &(remoteCreds[cred.id()]);
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*rc = cred;
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return Membership::ADD_ACCEPTED_NEW;
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case 1:
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return Membership::ADD_DEFERRED_FOR_WHOIS;
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}
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}
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Membership::AddCredentialResult Membership::addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const Tag &tag) { return _addCredImpl<Tag>(_remoteTags,_revocations,RR,tPtr,nconf,tag); }
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Membership::AddCredentialResult Membership::addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const Capability &cap) { return _addCredImpl<Capability>(_remoteCaps,_revocations,RR,tPtr,nconf,cap); }
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Membership::AddCredentialResult Membership::addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const CertificateOfOwnership &coo) { return _addCredImpl<CertificateOfOwnership>(_remoteCoos,_revocations,RR,tPtr,nconf,coo); }
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Membership::AddCredentialResult Membership::addCredential(const RuntimeEnvironment *RR,void *tPtr,const NetworkConfig &nconf,const Revocation &rev)
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{
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uint64_t *rt;
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switch(rev.verify(RR,tPtr)) {
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default:
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return ADD_REJECTED;
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case 0: {
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const Credential::Type ct = rev.type();
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switch(ct) {
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case Credential::CREDENTIAL_TYPE_COM:
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if (rev.threshold() > _comRevocationThreshold) {
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_comRevocationThreshold = rev.threshold();
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return ADD_ACCEPTED_NEW;
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}
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return ADD_ACCEPTED_REDUNDANT;
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case Credential::CREDENTIAL_TYPE_CAPABILITY:
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case Credential::CREDENTIAL_TYPE_TAG:
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case Credential::CREDENTIAL_TYPE_COO:
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rt = &(_revocations[credentialKey(ct,rev.credentialId())]);
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if (*rt < rev.threshold()) {
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*rt = rev.threshold();
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return ADD_ACCEPTED_NEW;
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}
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return ADD_ACCEPTED_REDUNDANT;
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default:
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return ADD_REJECTED;
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}
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}
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case 1:
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return ADD_DEFERRED_FOR_WHOIS;
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}
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}
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void Membership::clean(const uint64_t now,const NetworkConfig &nconf)
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{
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_cleanCredImpl<Tag>(nconf,_remoteTags);
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_cleanCredImpl<Capability>(nconf,_remoteCaps);
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_cleanCredImpl<CertificateOfOwnership>(nconf,_remoteCoos);
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}
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} // namespace ZeroTier
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